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The only thing I know about MMR is that it influences your matchup with other players. I'm assuming its similar to the ELO system but I'm not exactly sure what that is either.

What is MMR? How is it calculated?

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    I am thoroughly surprised this isn't a duplicate.
    – Paralytic
    Nov 26, 2013 at 16:44
  • @Paralytic It pretty much is.
    – Decency
    Nov 27, 2013 at 15:11
  • possible duplicate of Is the Elo system in League of Legends accurate?
    – Decency
    Nov 27, 2013 at 15:12
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    @Decency Riot has strayed away from the elo system, making their own called MMR. This is not a duplicate
    – Paralytic
    Nov 27, 2013 at 15:13
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    @Paralytic It's an obvious variation of Elo, regardless of what they'd like to call it. All good rating systems are.
    – Decency
    Nov 27, 2013 at 15:43

1 Answer 1

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Match Making Rank (MMR) is a hidden Elo based rating system that is used for match making in game queues. Your actual MMR, and the exact means by which it is calculated, is hidden from players, so we can only speculate as to how it works based on observation.

MMR values correspond roughly to tier/division placing, but your MMR can be higher or lower than your actual tier/division position, based on your recent performance. For example, you could be ranked Silver 3, but with a streak of wins your MMR will increase and you will notice that the other players in your matches will be Silver 1 or Gold 5.

MMR is also used to determine how many league points are awarded/deducted for wins/losses, taking into account your own current MMR, and the average MMR of each team.

Basically, MMR is where the game thinks you should be placed, based on recent performance, and it will help accelerate you toward that position (up or down), if you perform consistently.

Also worth noting is that each player has a separate MMR value for each queue. Thus you can experiment with new champions and strategies in normal queues and have a lower win rate and a lower MMR than in ranked, where you might rely on tried and tested gameplay.

A couple of sites out there will give you an indicative number for your ranked MMR:

  • LolKing provides a LolKing Score
  • OP.gg looks at your last 10 games, gives you an MMR guideline number, and tells you how it compares to your current ranking. You'll need at least 5 of your last 10 games to have been in ranked.

Important to note that both of these are just estimates, and are not official in any way.

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  • you may or may not wanna mention, sites that attempt to duplicate Riots mmr calculator. Lolking.net for example.
    – Paralytic
    Nov 26, 2013 at 16:46
  • Good point, added!
    – bbodien
    Nov 27, 2013 at 11:23
  • So, MMR is only for ranked?
    – LTPro
    Nov 28, 2013 at 9:00
  • @LTPro Every queue has its own, discrete MMR used to determine match making in that queue and game mode. Ranked queues are the only ones that award League Points based on your MMR and your results, and place you in tiers/divisions.
    – bbodien
    Nov 28, 2013 at 9:59

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